That would definitely be a fun project. I guess you would connect the sensor to a small processor which would drive steerable fins. Not sure RC aircraft give out much heat for a sensor to track though.
At the same time, I'm not sure if working on cheap guidance systems is the best idea at the moment - it could be used by Russias and North Koreas out there.
As for TLA - what’s wrong with asking questions? Especially when they might also provide you with a free legal advice wrt ITAR ;)